The Heat Method

This example reproduced this figure from the paper "The Heat Method for Distance Computation".

Data

The distance field is computed using heat_geodesic method from libigl. The field is stored as dist field in data/bunny_heat.ply.

Code

#!/usr/bin/env python

import hakowan as hkw
import math

# Customized color map.
colormap = ["#a69c65", "#9A9A07", "#983A06", "#7C070A", "#160507", "#060103", "#000000"]

# Step 1: Create a base layer.
base = hkw.layer("data/bunny_heat.ply").material(
    "Principled",
    # We used isocontour texture to visualize the geodesic distance field both as color
    # and as isocurves.
    color=hkw.texture.Isocontour(
        data="dist",
        texture1=hkw.texture.ScalarField("dist", colormap=colormap),
        texture2="lightgray",
        ratio=0.95,
        num_contours=100,
    ),
    roughness=0.5,
)

# Step 2: Adjust camera position.
config = hkw.config()
config.sensor.location = [0, 1.2, 3]

# Step 3: Render the image.
hkw.render(base, config, filename="results/bunny_heat.png")

# Step 4: Render the back side.
back_side = base.rotate(axis=[0, 1, 0], angle=math.pi)
hkw.render(back_side, config, filename="results/bunny_heat_back.png")